<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>

function onloadf() {
var myheading = decodeURIComponent(location.search.split('heading=')[1] ? location.search.split('heading=')[1].split('&')[0] : 'My First Heading');
var myparagraph = decodeURIComponent(location.search.split('paragraph=')[1] ? location.search.split('paragraph=')[1].split('&')[0] : 'My first paragraph.');
document.getElementById('myheading').innerHTML = myheading;
document.getElementById('myparagraph').innerHTML = myparagraph;
}

</script>
<head>
<body onload='onloadf();'>

<h1 id='myheading'>My First Heading</h1>

<p id='myparagraph'>My first paragraph.</p>

</body>
</html>